Globe-cleaner for arc-lamps.



R. H. READ.

GLOBE CLEANER FOR m LAMPS.

' APPLIOATIONTILED OCT. 25, 1906.

Patented Dec. 1, 1908.

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UNITED STATES PATENT OFFICE.

ROBERT H. READ, OF SGHIENEGTADY, NEW YORK, ASSIGNOR TO GENERAL ELECTRIC COM- PANY, A CORPORATION OF NEW YORK.

Specification of Letters Patent.

Patented Dec. 1, 1908.

Application filed October 25, 1905. Serial No. 340,525.

ful Improvements in Globe-Cleaners for- Arc-Lamps, of which the following is a specification.

1 This invention relates to inclosed arc lamps in which the electrodes are of the vice, operating automatically and -periodic-' ally, and serving to'wipe off the deposit; It is very doubtful, however, whether such an arrangement would be entirely effective with acarbon arc, as the carbon deposit adheres tenaciously to the surface of the globe. But

" with the flaming arcs, and especially with 'carbid electrodes, the deposit easily removed, the lightest touch being suflicient to dislodge it.

My invention consists in certain mechanical constructions and arrangements whereby a wiper is caused to remove'these deposits automatically. It is illustrated in the accompanying drawing, in which Figure 1 is an elevation of an inclosed arc lamp, partly in section, and embodying my improved wiper; Fig. 2 is a section of the globe holder on a larger scale}; Fig. 3 is a sectional plan view of the same, Fig. 4

shows the collar for supporting the wipers;

Fig. 5 is a cross section of a wiper; Fig. 6 is a diagram of circuits; and Fig. 7 is adetail of construction of the lower operating mechanism.

The lamp may be of any suitable con-- struction in which an inner globe 1 surrounds the are. I support this globe by resting its lower end on a mg 2 provided with external screw threads to receivew-a union 3. A suitable cushion, such as a heli-' cal spring 1, is interposed between the union and the globe. The ring has an inwardly projecting flange 5 which is supported on a circular shoulder 6 on. the stationary-holder 7 for the lower. electrode 8. It preferred to groove the ring or the shoulder or both .to

' form a raceway for a set of balls 9, constitut ing a ball bearing for the globe support 2, and enabling it torevolve easily on the holder 7. Inside this rotatable globe are arranged a-pair of stationary wipers. I prefer to use two though it is evident that a less or greater number may be rovided if desired. Each Wiper consists pre erably of a wire 10 surrounded with asbestos 11, or some other soft and refractory substance. The upper ends of the wipers pass pivotally through holes in the gas-cap 12, and are provided above said cap with small handles 13. The lower ends of the wipers are supported in a stationary part of the lamp, being preferably j ournaled in a collar 14 of non-conducting material, such as porcelain, which fits loosely upon a polygonal neck or projection 15 extending up centrally from the holder 7 and surrounding the lower electrode. The ends of the wires 10 may be headed to prevent their pulling out, and the heads may be received in notches 16 in the under side of the collar 14; said notches being filled with cement to insulate the wires, as shown in Fig. 2,

The wipers are curved to rest easily against the inside of the globe 1, and are preferably located in the plane of the hangers17 of the lamp frame, so as not to cast any additional shadows. A v I In order to revolve the globe, ,I prefer. to use an electric motor, such as the-electromagnet 18 in shunt to the lamp. The armature 19 of said magnet carries one of a pair of contacts 20 in the circuit ofsaid magnet. A

circuit, but the closing movement isretarded by a. time-limiting device, such as the dashpot 22, which, however, ofie'rs no obstruction to the quick attraction of the armature when the circuit of the magnet is finally closed. It will be seen that this construction operates electromagnet is conveniently mounted in the upper part of the lam as shown in Fig. 1. The armature is attaclied to the upper end of a long shaft 23 which runs down to a point near the holder 7 being journaled in earings 24 secured to the hanger 17. On the lower end of the shaft is an arm 25 carrying a pivoted'pawl 26. A spring 27 keeps said pawl in engagement with a ratchet wheel 28 on a short upri ht shaft 29. A pinion 30 on said shaft mes es with an annular s ring 21 retracts said armature to close said like an electricbell, but at a slow rate. The

set of teeth 31 formed on the periphery of the ring 2. j

The operation is as follows: At every energization of the electromagnet 18 the pawl 26 actuates the ratchetwheel 28, and causes a partial rotation of the globe support andglobe; Since the wipers are journaled at the mittent rotation of the globe carriesits entire surface ast them at every half revolution, thus e ecting a steady and continuous cleaning off of the deposit. The accumulation of dust in the bottom of the globe can be 7 emptied out whenever the lamp is trimmed.

When the globe is to be removed, the wipers are turned in towards the electrodes by moving the handles 13 away from the pins 32, as shown in dotted lines in Fig. l. The globe holder can then be lowered by loosening screws33, 33 and dropping the frame in guide tubes 17. When lowered the collar .and cap 12 may be slipped off the neck 15 and the globe then removed and emptied. When the globe and wipers are replaced, the

- collar will be guided to its seat on the neck by the lower carbon and the sides of the globe into the lower end of which it fits easily, a

best shown in Fig. 2.

'What I claim as newand desire to secure by Letters Patent of the United States, is,-

1. In aninclosed arc lamp, the combination with the inner lobe, of one or more wi ers therein extendmg lengthwise thereof and conforming to the profile of the globe.

2. In an inclosed arc lamp, the combinav tion with the inner globe, of a wi er therein which conforms to the profile o the globe,

my hand this 24th port for said globe, means for rotating it automatically, and one or more stationary wipers inside said globe.

5. In an inclosed arc lamp, the combination with the mner' globe, of electromagnetic tionary wipers inside said globe.

6. In an inclosed arc lamp, the combination with the inner lobe, of electrical means for rotating it step-bystep, and one or more stationary wipers inside said globe.

7. In an inclosed arc lamp,'the combination with a rotatable inner globe, of one o'r more stationary-wipers inside the same in the plane of the hangers supporting the lower electrode.

8. .In an inclosed arc lamp, the combination of an inner globe, a wiper, and means for automatically eflectin a slow relative movement to remove the eposit. v

.9. In an inclosed arc lamp, the combination of an inner globe, a 'wi-per, and means for automatically effecting a slow relative rotary movement of the two parts to remove the deposit.

; 1O.v In an inclosed arc lamp, the combination with a-rotatable globe support, of an electromagnet in shunt to the lamp, and

means whereby said magnet can rotate said:

support.

In witness whereof, I have hereunto set day of October, 1906; ROBERT H. READ.

-Witnesses: a

GENEVIEVE HAYNES, ALEX. F. MACDONALD- -means for rotating 1t, and one or more sta- 

